College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 3 - Section 3.6 - Mathematical Models: Building Functions - 3.6 Assess Your Understanding - Page 264: 15


See below.

Work Step by Step

The sides of the rectangle will be $r,2r$. Thus: a) $A(r)=r\cdot2r=2r^2$ b) The perimeter will be the length of the wire, so $p(r)=2(r+2r)=2\cdot3r=6r$
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